Keystones — Lintel
Five GCSE retrieval questions · 7 September 2019 · mathsvault.uk/keystones
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1. Number Converting to standard form
6900000
Answer: 6.9 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 35
Answer: (x + 7)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 20cm, angle = 49°. Find opposite
Answer: 23cm -
4. Ratio Mixed ratio problems
£155.00 is shared between A and B in the ratio 3:2. How much does A receive?
Answer: £93.00 -
5. Statistics Mean
The mean of 5 numbers is 30. If 4 of them are 17, 39, 15, 50, what is the missing number?
Answer: 29